Chuck for staybolts



J. B. HASTY.

CHUCK FOR STAYBOLTS.

APPLICATION FILED JULY 26,1915.

1,375,456,, Patented Apr. 19, 1921.

UNITED STATES PATENT:

com: 3. new, or sen IBEBNARDINO, CALIFORNIA, essrenoa 'I'O ron; shown, or

CHICAGO, ILLINOIS.

CHUCK FOR STAYBOL'IS.

To all whom it may concern: v

Be it known that I, JOHN B. HASTY, a citizen of the United States, residin in San Bernardino, in the county of San Bernardino and State of California, have invented a new and useful Improvement in Chucks for Staybolts, of which the following is a specification.

This invention relates in general to chucks and has more particular re erence to chucks provided for positioning stay-bolts 1n locomotive engines and the like, although it will be manifest as the invention is better understood that it may be effective for other and different use.

A principal object of this invention is the provision of a chuck for stay-bolts and the like which, while being of extremely simple and durable construction, can be used with e ual facility for turning a stay-bolt or oiiher member held in it in either direction, reversing being possible without removing the chuck from the stay-bolt.

A further object of the invention is the provision of a chuck of the character described in which the body or head can'be constructed of a single casting ready for the reception of the other parts without machine or other operation than merely the boring of a single hole or aperture.

Another and very important object of. the invention is the provision of a chuck of the character described'which will be adapted to operate upon stay-bolts and the like of different dimensions without substitution or adjustment of the parts. I :1

A further object of the invention is the construction ofsuch a chuck which may readily be made available for use in operating upon stay-bolts and other members of dimension without' its normal range through a simple and ready effected substitution of parts.

A further object of the invention is the provision of a chuck of the character described of smooth, outer cylindrical form on which will be provided no protuberances which might catch in or injure the person or clothing of the operator.

Another object of the invention is the provision of, a chuck adapted to receive Specification of Letters Patent.

Patented A t. 19, 1921.

Application filed m 2a, 1915. Serial No. 41,818. Y

provision of a chuck of the character de scribed of few and simple parts capable of being cheaply manufactured-and yet strong and durable in operation.

Other objects and advantages of the inventlon will be apparent as it is better understood from the following description when considered in connection with the accompanymg drawin illustrating -a preferred embodiment t ereof.

Referring to'the drawing,

Figure 1 is a side elevation of a chuck embodying my invention and showing the same in operation; f

Fi 2 is an enlarged section taken sub stantially on the line 2-2 of Fig. 1;

F1 3 is a section taken substantially on the line 3-3 of Fig. 2; and

Fig. 4 is a perspective view of the clutching element or dog incorporated in the clutch shown in the other views. 7

The stay-bolts used in locomotive engines frequently consist of a single threaded rod 5 of length materially greater than the set or riveted down upon the wall face. Theamount which this end must extend beyond the wall 8 is well determined, and it is nee 'essary that thepositioning of each bolt be accurate in order that a perfect holding of the stay-bolt end may be eifected. After the stay-bolt is in position it is cut oil. be-

an extension of like amount, which is riveted down to secure the outer end in place, finishing the positioning of the stay-bolt. These bolts are positioned by inserting them in the nearer threaded aperture 6 and then turning the bolts until they are in the desired accurate position. The mechanic inserting the bolt is not in a position to view its free end as it passes out of the sheet 8, an attendant usually being stationed where he can observe its exit from the sheet .8, and

yond the outer-face of the wall 7 to provide lbs by pounding upon one of, the plates or otherwise si naling the operator cause the rotation of t e bolt to cease. It frequently happens that the bolt is not stopped soon enough and it becomes necessary to reverse its direction of rotation to bring it back to desired position.

In accordance with my invention I provide a chuck generally designated at 9 for rotating the stay-bolts accurately into place, said chuck being adapted to turn the staybolt in a positive rotation to cause it to enter successively the plates 7 and 8 and to give it a negative rotation should occasion require that the bolt be retracted to b ring it to accurate position. The chuck shown on the drawing and illustrating a preferred embodiment of my invention, consists of a one-piece casting formipg the head 10, a clutching element or dog 11 and a pivot and holding pin 12 for the dog. The head 10, in the present instance, is rovided with a flat sided shank 13 adapte to be gripped for driving by an air motor or other suitable source of energy. The head 10 is provided with a large central cylindrical opening 14 in line with the shank 13 and into which an end 15 of a stay-bolt may be inserted. It is also provided with an internal pocket 16 communicating with the opening 14. This pocket is located well inwardly of the front of the head so that a partition wall 17 is provided in front of the pocket. The clutching element or dog 11 in the present instance is preferably constructed of tool steel and has an operative face 18 composed of a plurality oflongitudinally extending relatively sharp serrations 19' lying in a substantially flat plane to dispose them at different distances from the pivotal axis of the dog. Beneath the operative face an aperture 21 extending lengthwise of and through the dog is provided. When the dog is 1n position this aperture is in registration with an aperture 22 disposed through the head from the rear of the pocket and an aperture 23 disposed through the wall 17 at the front of the pocket, and through these apertures extends the pivot pin 12 which secures the dog in place. The pivot pin and the apertures through which 'it extends are tapered in order that it may tightly engage in lace Without providing protuberance .on the ont and rear faces of the head. The operative face of the dog is angularly disposed with respect to its pivotal axis and is higher at the rear than at the front so that stay-bolts of different dimension may be engaged without requiring adjustment'of the clutch, the diameter of the stay-bolt determining its exact engagement with the dog when thrust into the head. Stay-bolts ordinarily vary in diameter from fteen-sixteenths of an inch to an inch and one-sixteenth and a single dog within the chuck head can readily take care of this range. The pin 12 may be easily removed and a dog of larger or smaller dimension substituted for the one in place should it be desirable to use the chuck or stay-bolts of less or greater diameter.

'It Wlll be manifest that a chuck embodying my invention is wholly devoid of any outwardl extending parts or protuberances that mig t catch in the clothing or in the person of the operator.

The shank 13 of the chuck is placed slightly off center in order to posit1on it nearly in line with the axes of stay-bolts of varying diameter. It is placed substantially at the center of the locus of positions of the stay-bolts normally to be turned by the chuck. In a chuck constructed as described for operating upon stay-bolts of dibe made in the form, construction and ar-' rangement of the parts without departing from the spirit and scope of the invention or sacrificing any of its material advanta es, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A chuck for stay-bolts and the like comprising a hollow head in which the end of a stay-bolt may be inserted, and a rocking clutching element inserted in said head and held in place by a pin extending through the head.

2. A chuck for stay-bolts and the like, comprising three members,-one' a hollow head intowhich the end of the stay-bolt may be inserted and provided "with a pocket at one side; another, a clutching element in said recess; and a third, a pin through the head and the element in said recess.

3. A chuck for sta -bolts and the like comprising a hollow ead into which the end of the stay-bolt may be inserted and having an internal recess communicating with the hollow of said head, a clutching element inserted into said recess through the hollow of said head and adapted to engage the end of said stay-bolt, and a pin disposed through said head fo holding said stay-bolt in position. v

In testimony whereof, I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN B. HASTY. 

